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According to the electromagnetic field distributions, there exist two kinds of coupled spoof surface plasmon polaritons(SSPPs), the symmetric and anti-symmetric modes, in the three-dimensional(3D) subwavelength spoof–insulator–spoof(SIS) waveguide. We study the dispersion and excitation of the two kinds of coupled SSPPs supported by the 3D SIS waveguide. The evolution of the dispersion with the thickness and gap width of the waveguide is numerically investigated,and we give a theoretical analysis according to the coupling mechanism. Specially, based on the coupling mechanism,we design a zipper structure, through which the excitation and propagation of the anti-symmetric coupled modes can be realized effectively. 相似文献
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选择溶菌酶、胃蛋白酶、卵清蛋白、牛血红蛋白和γ-球蛋白为模板,考察两性聚丙烯酰胺冰胶的分子印迹功能。预聚溶液中除了丙烯酰胺、甲叉双丙烯酰胺外,还含有作为功能单体的丙烯酸和烯丙基胺,因此所得聚合物中既有酸性基团,也有碱性基团,有助于在分子水平上识别同样是两性物质的蛋白质。上述蛋白质的分子量、等电点差异显著,且涵盖了很宽的范围。利用同一单体溶液即可合成对所有蛋白质均有印迹效果的聚合物,其分子量和等电点无影响。模板分子在毛细管印迹柱中的保留时间大于非印迹柱中的保留时间。溶菌酶的印迹因子高达7.0,γ-球蛋白最小(2.0),其它蛋白质介于二者之间。本研究结果表明,两性聚丙烯酰胺冰胶是印迹各种蛋白质的理想材料,在蛋白质的识别、纯化和去除方面具有极大的潜力。 相似文献
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